High-performance piezoelectric-energy-harvester and self-powered mechanosensing using lead-free potassium–sodium niobate flexible piezoelectric composites. Issue 34 (14th August 2018)

• Record Type: Journal Article
• Authors: Wu, Mengjun; Zheng, Ting; Zheng, Haiwu; Li, Jifang; Wang, Weichao; Zhu, Mingsai; Li, Fengzhu; Yue, Gentian; Gu, Yuzong; Wu, Jiagang
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 34(2018)
• Page Start: 16439
• Page End: 16449
• Publication Date: 2018-08-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta05887c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A flexible piezoelectric nanogenerator (PENG) was fabricated based on a new inorganic piezoelectric KNN–BNZ–AS–Fe, which exhibited the great potential in energy harvesting and self-powered mechanosensing. Abstract : Lead-free piezoelectric materials have recently drawn extensive attention because of their high piezoelectric properties and for being harmless to the human body. We explored a high-output flexible lead-free piezoelectric nanogenerator (PENG) based on new inorganic piezoelectric 0.91K0.48 Na0.52 NbO3 –0.04Bi0.5 Na0.5 ZrO3 –0.05AgSbO3 –0.2% Fe2 O3 (KNN–BNZ–AS–Fe) particles for the first time and which had an ultrahigh piezoelectric coefficient ( d 33 ) of ∼500 pC N −1 . The PENG was fabricated from KNN–BNZ–AS–Fe particles and a PDMS matrix, and exhibited a linear relation between the output voltage and input pressure within a certain pressure range. An optimal output with a large recordable open-circuit voltage ( V OC ) of 52 V and a short-circuit ( I SC ) current of 4.8 μA was obtained under a vertical force of 25 N at 2 Hz. The PENG was demonstrated to be able to successfully drive commercial light emitting diodes (LEDs) without any storage unit, which suggests that the biocompatible KNN–BNZ–AS–Fe-based PENG has realistic application prospects as a power source. Furthermore, the PENG could also potentially be utilized as a mechanical sensing counter and in collision alarm equipment. This work provides a new direction for lead-free piezoelectric materials in the field of self-powered mechanosensation for potential applications in areas such as artificial intelligence, soft robotics, and biomedical devices.